1212123431 has 8 divisors (see below), whose sum is σ = 1257784704. Its totient is φ = 1167256440.

The previous prime is 1212123389. The next prime is 1212123439. The reversal of 1212123431 is 1343212121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1212123431 - 2²⁶ = 1145014567 is a prime.

It is a super-2 number, since 2×1212123431² = 2938486423958423522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212123439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195461 + ... + 201566.

It is an arithmetic number, because the mean of its divisors is an integer number (157223088).

Almost surely, 2^1212123431 is an apocalyptic number.

1212123431 is a deficient number, since it is larger than the sum of its proper divisors (45661273).

1212123431 is an equidigital number, since it uses as much as digits as its factorization.

1212123431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 397141.

The product of its digits is 288, while the sum is 20.

The square root of 1212123431 is about 34815.5630573455. The cubic root of 1212123431 is about 1066.2252148624.

Adding to 1212123431 its reverse (1343212121), we get a palindrome (2555335552).

The spelling of 1212123431 in words is "one billion, two hundred twelve million, one hundred twenty-three thousand, four hundred thirty-one".